NARAL Approval Ratings: Let's Shift Gears

Greg, in response to your post can you (or anyone else) point me in the direction of the criteria for the NARAL approval ratings (other than as discussed in the WSJ editorial)?  I am wondering exactly what the Casey 65% approval rating means - eg, is one of their plus signs general access to health insurance for women?  In fairness to the complexity of the debate, and in fairness to the integrity of the folks involved, it seems that a NARAL percentage doesn't really give us the information that we need.  And more to the point for our discussion here, I wonder if we want to shift gears - why should the NARAL scale become a point of reference for our reflection on how we evaluate folks?  Why don't we make up our own categories, starting, perhaps, with the criteria discussed in the US Bishop's 2007 statement, "Forming Consciences for Faithful Citizenship?"